Upgrade offline-github-changelog to version 2.4.0

[depfu[bot]]

👉 This PR is queued up to get rebased by Depfu

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ offline-github-changelog (^1.6.1 → ^2.4.0)

Sorry, we couldn't find anything useful about this release.

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[sunesimonsen]

@depfu rebase

[papandreou]

Did we resolve that problem where the version of ejs that gets pulled in by newer versions of offline-github-changelog breaks the documentation site builder?